An occurrence of approx. 74 ka Youngest Toba tephra from the western continental margin of India
IR@NIO: CSIR-National Institute Of Oceanography, Goa
View Archive Info| Field | Value | |
| Creator |
Pattan, J.N.
Shane, P. Pearce, N.J.G. Banakar, V.K. Parthiban, G. |
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| Date |
2006-08-26T15:15:27Z
2006-08-26T15:15:27Z 2001 |
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| Identifier |
Current Science, vol. 80(10), 1322-1326pp.
http://drs.nio.org/drs/handle/2264/267 |
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| Description |
A dispersed volcanic ash layer was recovered at ~6 300 cm depth in a 5.52 m long sediment core collected at a latitude 9~'21'E from a water depth of 2300 m on the Western Continental Margin of India (WCMI). Glass shards from ash layer were studied for morphology, major, trace and rare earth element concentration to trace the source. Bubble wall junction-type morphology of glass shard suggests magmatic origin. Shards have high SiO2 (77%) and total alkalies (8.5%), indicating rhyolitic composition. The major, trace and rare earth element composition of these glass shards are indistinguishable from that of Youngest Toba ash of ~6 74 ka from the Northern Sumatra and confirm as the source. The new occurrence of Youngest Toba Tuff from the WCMI, Central Indian Ocean Basin and South China Sea Basin suggests a reassessment of the ash volume and global climatic implications.
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| Format |
173056 bytes
application/pdf |
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| Language |
en
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| Publisher |
Indian Academy of Sciences
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| Subject |
marine sediments
Indian Ocean |
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| Title |
An occurrence of approx. 74 ka Youngest Toba tephra from the western continental margin of India
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| Type |
Article
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